Edwin Hubble
Distribution of Luminosity in Elliptical Nebulae.the Astrophysical Journal, Vol. LXXI, May 1930 - Page 231-276 p. With the first printing of Hubble's work at Mt. Wilson in 1923 and 24, in which he discovered that the Milky Way was not, as previously believed, the extent of the universe, but just one galaxy among many [Attributes: First Edition; Soft Cover]
[Bookseller: Andersens Antikvariat]